CN108644022B - Natural gas engine hot shutdown detection control method - Google Patents
Natural gas engine hot shutdown detection control method Download PDFInfo
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- CN108644022B CN108644022B CN201810457001.7A CN201810457001A CN108644022B CN 108644022 B CN108644022 B CN 108644022B CN 201810457001 A CN201810457001 A CN 201810457001A CN 108644022 B CN108644022 B CN 108644022B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D23/00—Controlling engines characterised by their being supercharged
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/606—Driving style, e.g. sporty or economic driving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a natural gas engine hot stop detection control method, which comprises the steps of detecting function activation condition setting, hot stop judgment condition setting, starting an engine, detecting function activation, hot stop judgment, hot stop processing, fault accumulation processing and the like; the invention can effectively improve the driving habit of a driver, strengthen the restriction of the driving habit, when the bad shutdown habit (namely the hot shutdown phenomenon) of the driver is detected each time, the engine ECU can carry out the fault accumulation once, and after the fault accumulation frequency reaches the set value, the engine ECU can carry out the alarm and limit the starting of the engine by the measures of lightening the MIL lamp, limiting the torque and the like, thereby playing the roles of fault reminding and protecting the engine, until the fault code of the engine is eliminated by an external diagnostic device, the engine can be normally started and operated again, forcibly impelling the driver to change the shutdown habit, and prolonging the service life of the engine supercharger.
Description
Technical Field
The invention relates to the technical field of natural gas engine operation protection, in particular to a natural gas engine thermal shutdown detection control method.
Background
In daily driving of a motor vehicle, the engine continues to operate for different time periods according to different strokes, but no matter the stroke length, ninety percent or more drivers can perform immediate parking operation after the motor vehicle reaches a destination, and the engine immediately stalls after the motor vehicle runs at high speed and high temperature for a long time, which is a great hazard because: the turbocharger of the engine utilizes engine oil to lubricate and cool a rotor bearing, after the engine runs for a section at high speed, the rotating speed and the temperature of the turbocharger are extremely high, if the engine is directly stopped, an oil pump can directly stop working, the pressure of the engine oil is rapidly reduced to 0, but the turbocharger has a slow speed process, the high temperature of a turbine part of the turbocharger is transmitted to the middle, the heat in a bearing supporting shell can not be rapidly taken away, and meanwhile, a rotor of the turbocharger still rotates at high speed under the inertia effect, so that if the engine is suddenly stopped in a heat engine state, the engine oil retained in the turbocharger can be overheated to damage the bearing and the shaft, and the thermal stop of the engine needs to be detected and controlled to eliminate the damage of the bearing and the shaft caused by.
Disclosure of Invention
The invention aims to solve the technical problem of providing a natural gas engine hot stop detection control method which can strengthen and restrict driving habits and prolong the service life of an engine supercharger.
In order to solve the technical problems, the technical scheme of the invention is as follows: a natural gas engine hot stop detection control method comprises the following steps,
step one, setting of detection function activation conditions
The engine ECU sets threshold values of parameters for activation of the detection function, including a threshold value StarT of the StarT time, a threshold value EngT1 of the coolant temperature, a threshold value OilT1 of the engine oil temperature, a threshold value N1 of the rotational speed, and a threshold value Rl of the load,
when the starting time of the engine is detected to be more than or equal to the Start, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the temperature of the cooling liquid of the engine is detected to be more than or equal to EngT1, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the engine oil temperature of the engine is detected to be more than or equal to OilT1, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the rotating speed of the engine is detected to be larger than or equal to N1 and the duration time of the load larger than or equal to Rl exceeds T, the corresponding logic value in the engine ECU is 1, otherwise, the logic value is 0;
step two, setting of hot shutdown judgment conditions
The engine ECU sets the threshold values of parameters for judging the thermal stop, including a coolant temperature threshold EngT2, a preswirl temperature threshold Tur2, an engine oil temperature threshold OilT2, a rotating speed threshold N2 and a load threshold R2,
when the engine is stopped, when the temperature of the cooling liquid of the engine is less than EngT2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
when the temperature of the engine before the vortex is less than Tur2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
when the engine is stopped, when the engine oil temperature of the engine is less than Oilt2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
when the engine is stopped, when the rotating speed of the engine is less than N2 and the load is less than Rl2, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
step three, starting the engine
After the engine is started and operated, the starting time, the temperature of cooling liquid, the temperature of engine oil, the rotating speed and the load of the engine are detected in real time, and all detection results are transmitted to an engine ECU (electronic control Unit) for comparison and processing of the engine ECU;
step four, detecting function activation
The detection function activation conditions are:
condition 1: the starting time is more than or equal to the StarT,
condition 2: the temperature of the cooling liquid is more than or equal to EngT 1;
condition 3: the temperature of the engine oil is more than or equal to OilT 1;
condition 4: the rotating speed is more than or equal to N1, and the duration of the load more than or equal to Rl exceeds T;
the logical operation relationship of the above conditions is: the condition 1+ the condition 2+ the condition 3+ the condition 4 is F1, when F1 is 1, the detection function is activated, and the next step is automatically carried out; when F1 is equal to 0, returning to the previous step;
step five, judging hot shutdown
The engine ECU receives the stop instruction from the key switch T15, and the engine is stopped, and the hot stop determination conditions are:
condition 1: the coolant temperature is less than EngT 2;
condition 2: the pre-vortex temperature is less than Tur 2;
condition 3: engine oil temperature < OilT 2;
condition 4: speed < N2 and load < R2
The logical operation relationship of the above conditions is: condition 1, condition 2, condition 3, condition 4 being F2, when F2 being 1, it is determined that the engine is in a normal stop state, and the process returns to the previous step; when F2 is equal to 0, the engine is judged to be in a hot stop state, and the next step is automatically carried out;
step six, hot shutdown treatment
When the engine is judged to be in a hot shutdown state, when the engine is started next time, the engine ECU reports a fault code, a fault alarm lamp MIL of an engine electric control system is lightened, and faults of the engine ECU are accumulated once;
step seven, fault accumulation processing
When the accumulated failure times are more than or equal to Num, the engine ECU reports an engine failure code, and when the engine is restarted to run, the engine ECU controls the torque limiter to execute torque limiting action; and when the accumulated number of faults is less than Num, automatically returning to the previous step.
As a preferable technical proposal, the method also comprises the following steps,
step eight, fault elimination
And (4) externally connecting an engine ECU with diagnostic equipment to eliminate engine fault codes, and jumping to the step one when the engine is restarted.
Preferably, the threshold StarT of the starting time is not less than 1600S, the threshold EngT1 of the coolant temperature is not less than 70 ℃, the threshold OilT1 of the engine oil temperature is not less than 75 ℃, the threshold N1 of the rotation speed is not less than 1450N/S, and the threshold Rl of the load is not less than 60%.
Preferably, the threshold value EngT2 of the coolant temperature is not less than 90 ℃, the threshold value Tur2 of the preswirl temperature is not less than 650 ℃, the threshold value OilT2 of the engine oil temperature is not less than 95 ℃, the threshold value N2 of the rotating speed is not less than 1200N/S, and the threshold value R2 of the load is not less than 60%.
As an improvement of the technical scheme, the condition that the rotating speed of the engine is larger than or equal to N1, the duration time of the load is larger than or equal to Rl and exceeds T in the T condition is a set value, and Num in Num which the accumulated number of faults is larger than or equal to Num is also a set value.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: the engine ECU can give an alarm and limit the starting of the engine by means of measures such as lightening an MIL lamp and limiting torque after detecting that a driver has bad shutdown habits (namely, hot shutdown phenomena) every time, thereby playing the roles of fault reminding and engine protection, and the engine can be normally started and operated again until engine fault codes are eliminated through external diagnostic equipment, forcibly prompting the driver to change the shutdown habits, and prolonging the service life of an engine supercharger.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a simplified work flow diagram of an embodiment of the present invention.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
As shown in fig. 1, a control method for detecting a hot stop of a natural gas engine comprises the following steps,
step one, setting of detection function activation conditions
The threshold values of the parameters at the time of activation of the detection function, including the threshold value StarT of the StarT time, the threshold value EngT1 of the coolant temperature, the threshold value OilT1 of the oil temperature, the threshold value N1 of the rotational speed, and the threshold value Rl of the load, are set in the engine ECU, and the following settings are made in the engine ECU:
when the starting time of the engine is detected to be more than or equal to the Start, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the temperature of the cooling liquid of the engine is detected to be more than or equal to EngT1, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the engine oil temperature of the engine is detected to be more than or equal to OilT1, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the rotating speed of the engine is larger than or equal to N1 and the duration time of the load larger than or equal to Rl exceeds T, the corresponding logic value in the engine ECU is 1, otherwise, the logic value is 0.
In this step, the threshold StarT of the StarT time is not less than 1600S, the threshold EngT1 of the coolant temperature is not less than 70 ℃, the threshold OilT1 of the engine oil temperature is not less than 75 ℃, the threshold N1 of the rotation speed is not less than 1450N/S, and the threshold Rl of the load is not less than 60%. Specifically, the threshold StarT of the StarT time may be 1800S, the threshold EngT1 of the coolant temperature may be 75 c, the threshold OilT1 of the oil temperature may be 80 c, the threshold N1 of the rotation speed may be 1500N/S, and the threshold Rl of the load may be 60%.
Step two, setting of hot shutdown judgment conditions
The threshold values of the parameters for determining the thermal shutdown, including the threshold value EngT2 of the coolant temperature, the threshold value Tur2 of the preswirl temperature, the threshold value OilT2 of the oil temperature, the threshold value N2 of the rotational speed, and the threshold value R2 of the load, are set in the engine ECU, and are set as follows:
when the engine is stopped, when the temperature of the cooling liquid of the engine is less than EngT2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
when the temperature of the engine before the vortex is less than Tur2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
when the engine is stopped, when the engine oil temperature of the engine is less than Oilt2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
at shutdown, when the engine speed < N2 and load < Rl2, the corresponding logic value in the engine ECU is 1, otherwise it is 0.
In this embodiment, the threshold value EngT2 of the coolant temperature is not less than 90 ℃, the threshold value Tur2 of the preswirl temperature is not less than 650 ℃, the threshold value OilT2 of the engine oil temperature is not less than 95 ℃, the threshold value N2 of the rotation speed is not less than 1200N/S, and the threshold value R2 of the load is not less than 60%. Specifically, the threshold value EngT2 for the coolant temperature may be set to 90 ℃, the threshold value Tur2 for the preswirl temperature may be set to 650 ℃, the threshold value OilT2 for the oil temperature may be set to 98 ℃, the threshold value N2 for the rotation speed may be set to 1200N/S, and the threshold value R2 for the load may be set to 60%.
Step three, starting the engine
After the engine is started, the starting time, the temperature of the cooling liquid, the temperature of the engine oil, the rotating speed and the load of the engine are detected in real time, and all detection results are transmitted to the engine ECU for comparison and processing of the engine ECU.
Step four, detecting function activation
The detection function activation conditions are:
condition 1: the starting time is more than or equal to the StarT,
condition 2: the temperature of the cooling liquid is more than or equal to EngT 1;
condition 3: the temperature of the engine oil is more than or equal to OilT 1;
condition 4: the rotating speed is greater than or equal to N1, the duration time of the load is greater than T, the rotating speed of the engine is greater than or equal to N1, the duration time of the load is greater than T, T in the condition that T is greater than T is a set value, and the rotating speed can be freely set according to the actual control requirements of a user.
The logical operation relationship of the above conditions is: the condition 1+ the condition 2+ the condition 3+ the condition 4 is F1, when F1 is 1, the detection function is activated, and the next step is automatically carried out; when F1 is equal to 0, the process returns to the previous step, that is, after the engine is started, and when any one of the above conditions in this step is satisfied, the detection function is activated.
Step five, judging hot shutdown
The engine ECU receives the stop instruction from the key switch T15, and the engine is stopped, and the hot stop determination conditions are:
condition 1: the coolant temperature is less than EngT 2;
condition 2: the pre-vortex temperature is less than Tur 2;
condition 3: engine oil temperature < OilT 2;
condition 4: speed < N2 and load < R2
The logical operation relationship of the above conditions is: condition 1, condition 2, condition 3, condition 4 being F2, when F2 being 1, it is determined that the engine is in a normal stop state, and the process returns to the previous step; when F2 is equal to 0, the engine is judged to be in a hot stop state, the next step is automatically carried out, namely after the detection can be activated, the engine receives a stop command from a key switch T15, the engine is stopped, when the conditions above the step are met, the engine is judged to be in a normal stop state, and otherwise, the engine is in the hot stop state.
Step six, hot shutdown treatment
When the engine is judged to be in a hot stop state, when the engine is started next time, the engine ECU reports a fault, if the engine ECU reports that an engine fault code is 1, and a fault alarm lamp MIL of an engine electric control system is lightened, the faults of the engine ECU are accumulated once;
step seven, fault accumulation processing
When the accumulated failure times are more than or equal to Num, the engine ECU reports an engine failure code, and when the engine is restarted to run, the engine ECU controls the torque limiter to execute torque limiting action; and when the accumulated number of faults is less than Num, automatically returning to the previous step. If it is determined that the engine is in the hot stop state, the engine ECU reports an engine fault code of 2 for easy recognition by a serviceman. In this step, Num of the number of accumulated faults equal to or greater than Num is also a set value, if the control is strict, the Num value can be set smaller, and if the control is relaxed, the Num value can be set larger.
The present embodiment further comprises the following steps,
step eight, fault elimination
And (3) externally connecting a diagnostic device to the engine ECU to eliminate an engine fault code, and jumping to the step one when the engine is restarted, wherein the diagnostic device is engine maintenance equipment well known by persons skilled in the art and is not described in detail herein.
The invention can effectively improve the driving habit of a driver, strengthen the restriction of the driving habit, when the bad shutdown habit (namely the hot shutdown phenomenon) of the driver is detected each time, the engine ECU can carry out the fault accumulation once, and after the fault accumulation frequency reaches the set value, the engine ECU can carry out the alarm and limit the starting of the engine by the measures of lightening the MIL lamp, limiting the torque and the like, thereby playing the roles of fault reminding and protecting the engine, until the fault code of the engine is eliminated by an external diagnostic device, the engine can be normally started and operated again, forcibly impelling the driver to change the shutdown habit, and prolonging the service life of the engine supercharger.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A natural gas engine hot shutdown detection control method is characterized in that: comprises the following steps of (a) carrying out,
step one, setting of detection function activation conditions
The engine ECU sets threshold values of parameters for activation of the detection function, including a threshold value StarT of the StarT time, a threshold value EngT1 of the coolant temperature, a threshold value OilT1 of the engine oil temperature, a threshold value N1 of the rotational speed, and a threshold value Rl of the load,
when the starting time of the engine is detected to be more than or equal to the Start, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the temperature of the cooling liquid of the engine is detected to be more than or equal to EngT1, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the engine oil temperature of the engine is detected to be more than or equal to OilT1, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
when the rotating speed of the engine is detected to be larger than or equal to N1 and the duration time of the load larger than or equal to Rl exceeds T, the corresponding logic value in the engine ECU is 1, otherwise, the logic value is 0;
step two, setting of hot shutdown judgment conditions
The engine ECU sets the threshold values of parameters for judging the thermal stop, including a coolant temperature threshold EngT2, a preswirl temperature threshold Tur2, an engine oil temperature threshold OilT2, a rotating speed threshold N2 and a load threshold R2,
when the engine is stopped, when the temperature of the cooling liquid of the engine is less than EngT2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
when the temperature of the engine before the vortex is less than Tur2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
when the engine is stopped, when the engine oil temperature of the engine is less than Oilt2, the corresponding logic value in the ECU of the engine is 1, otherwise, the corresponding logic value is 0;
when the engine is stopped, when the rotating speed of the engine is less than N2 and the load is less than Rl2, the corresponding logic value in the engine ECU is 1, otherwise, the corresponding logic value is 0;
step three, starting the engine
After the engine is started and operated, the starting time, the temperature of cooling liquid, the temperature of engine oil, the rotating speed and the load of the engine are detected in real time, and all detection results are transmitted to an engine ECU (electronic control Unit) for comparison and processing of the engine ECU;
step four, detecting function activation
The detection function activation conditions are:
condition 1: the starting time is more than or equal to the StarT,
condition 2: the temperature of the cooling liquid is more than or equal to EngT 1;
condition 3: the temperature of the engine oil is more than or equal to OilT 1;
condition 4: the rotating speed is more than or equal to N1, and the duration of the load more than or equal to Rl exceeds T;
the logical operation relationship of the above conditions is: the condition 1+ the condition 2+ the condition 3+ the condition 4 is F1, when F1 is 1, the detection function is activated, and the next step is automatically carried out; when F1 is equal to 0, returning to the previous step;
step five, judging hot shutdown
The engine ECU receives the stop instruction from the key switch T15, and the engine is stopped, and the hot stop determination conditions are:
condition 1: the coolant temperature is less than EngT 2;
condition 2: the pre-vortex temperature is less than Tur 2;
condition 3: engine oil temperature < OilT 2;
condition 4: speed < N2 and load < R2
The logical operation relationship of the above conditions is: condition 1, condition 2, condition 3, condition 4 being F2, when F2 being 1, it is determined that the engine is in a normal stop state, and the process returns to the previous step; when F2 is equal to 0, the engine is judged to be in a hot stop state, and the next step is automatically carried out;
step six, hot shutdown treatment
When the engine is judged to be in a hot shutdown state, when the engine is started next time, the engine ECU reports a fault code, a fault alarm lamp MIL of an engine electric control system is lightened, and faults of the engine ECU are accumulated once;
step seven, fault accumulation processing
When the accumulated failure times are more than or equal to Num, the engine ECU reports an engine failure code, and when the engine is restarted to run, the engine ECU controls the torque limiter to execute torque limiting action; and when the accumulated number of faults is less than Num, automatically returning to the previous step.
2. The natural gas engine hot stop detection control method according to claim 1, characterized in that: the method also comprises the following steps of,
step eight, fault elimination
And (4) externally connecting an engine ECU with diagnostic equipment to eliminate engine fault codes, and jumping to the step one when the engine is restarted.
3. A natural gas engine hot stop detection control method as claimed in claim 1 or 2, characterized in that: the threshold StarT of the starting time is not less than 1600S, the threshold EngT1 of the coolant temperature is not less than 70 ℃, the threshold OilT1 of the engine oil temperature is not less than 75 ℃, the threshold N1 of the rotating speed is not less than 1450N/S, and the threshold Rl of the load is not less than 60%.
4. A natural gas engine hot stop detection control method as claimed in claim 1 or 2, characterized in that: the threshold value EngT2 of the temperature of the cooling liquid is not less than 90 ℃, the threshold value Tur2 of the temperature before vortex is not less than 650 ℃, the threshold value OilT2 of the temperature of the engine oil is not less than 95 ℃, the threshold value N2 of the rotating speed is not less than 1200N/S, and the threshold value R2 of the load is not less than 60%.
5. A natural gas engine hot stop detection control method as claimed in claim 1 or 2, characterized in that: the rotating speed of the engine is larger than or equal to N1, the duration time of the load larger than or equal to Rl exceeds T in the condition of T is a set value, and Num in Num which is larger than or equal to the accumulated number of faults is also a set value.
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